Upgrading binocular coatings
Posted 24 June 2006 - 10:52 AM
If I had a binocular with coated or fully-coated optics, is there some place I could send it to be made into a fully multi-coated binocular?
Posted 24 June 2006 - 11:04 AM
In order to apply new coatings and insure proper thickness, the original coatings must be remove. You can't do that without changing the figure of the glass. See the recent thread about removing ruby coatings.
The short answer is NO.
Posted 24 June 2006 - 01:22 PM
Too bad, the dearth of FMC high-quality porros could have been offset by upgrading the coatings on some of the old classics.
Posted 24 June 2006 - 02:38 PM
Posted 25 June 2006 - 03:19 AM
I may be misconstruing what you are saying, but if you look starting on page 129 in "Choosing, Using & Repairing Binoculars" (J. W. Seyfried © 1995), he states that this is possible ONCE an appropriate lab is found, cost not withstanding.
Did you mean a proc. for the ruby lens coatings only? I'm a little in the dark here.
I must add that we actually did this three or so times with our coating vendor who supported our lab. We (the lab) were adamant that the optic NOT be refigured in any way whatsoever (which was beyond the means of the coating house anyway).
It was "black hole" MIL stuff, so I can only say the following. It involved a very large optical surface that was softer than glass. Because of coating problems, some pieces had to be recoated. The removal was basically an ELECTRO-CHEMICAL process, and it did NOT affect the figure of the surface. I am not certain how this might come into play with the FMC that we see today. We coated out at three layers max!
However, all of that aside, the question remains for the consumer: Is it worth it? I highly doubdt it. The few percentage gain in transmission would cost too much per square inch of aperture.
Posted 25 June 2006 - 05:37 AM
BTW, on another note, there is nothing to stop you from coating a previously uncoated optic.
BTW2, for those that are wondering, mirror stripping and recoating is completely different than AR coating.
Posted 25 June 2006 - 11:14 AM
But I agree with everyone who has indicated that, even if possible, this recoating (or first coating) is really not practical in a cost effective sense. With so many reasonably priced FMC binoculars on the market today, it's a heck of a lot cheaper and easier to find the one that suits.
Posted 25 June 2006 - 11:42 AM
A correspondent of mine has been able to have binoculars coated, perhaps only single coatings, somewhere in the Czech Republic, but he was dealing with some examples of those uncoated German military optics. To be sure, he was a collector more than a user and wanted a FLAK glass updated.
Posted 25 June 2006 - 06:39 PM
Bob in NM
Posted 26 June 2006 - 03:17 AM
Yes, I know and agree, the book does not delineate exactly what methods are used. Also, because of the copious grammatical errors in the book, it is hard to read between the lines, which, BTW, drives me to crazy.
Yes, I assumed the coating processes are completely different for mirrors (especially ours) and for glass. That's why I put in the disclaimer about FMC. I've never been in a situation where I was privy to the coating process of binoculars. I'll leave that to the experts, as it were.
Thanks for the update.
Posted 26 June 2006 - 04:53 AM
Posted 26 June 2006 - 05:52 AM
Who joins my vote?
Posted 26 June 2006 - 09:49 AM
Posted 27 June 2006 - 08:54 AM
It can be done, and I have done it, with both german flaks and old B&L 7x50s. There are a number of firms that do this work, Majestic Optical coatings did some, with in my opinion very good result. (Another firm did some more, with less positive results) just type in Optical coatings into search engine, and start dialing the phone.
To remove old coatings auto windshield polish is very gently used. Yes I know it can change the figure of the glass, but with typical mags used in binos, I dont think it can be seen.
Cost is about $200 for a run, depending upon the coatings selected. HAVE FUN.
Posted 27 June 2006 - 09:45 AM
Posted 27 June 2006 - 10:00 AM
Posted 27 June 2006 - 10:45 AM
The we is my friend Steve, who has some navy optical shop experience, and was doing his own binos for a number of years.
Posted 27 June 2006 - 10:51 AM
Posted 27 June 2006 - 02:06 PM
Ah, 'ya just don't get such deep, thought provoking lyrics, anymore.